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roadblock (n.)

"barrier or obstruction on a road," usually for military or police purposes, 1940, from road (n.) + block (n.2).

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Definitions of roadblock from WordNet

roadblock (n.)
any condition that makes it difficult to make progress or to achieve an objective;
Synonyms: barrier
roadblock (n.)
a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc.;
Synonyms: barricade
From wordnet.princeton.edu